Automatic Drilling And Riveting Path Planning And Riveting Deformation Prediction For Civil Aircraft Cabin Door

As a key technology in the field of Aeronautical Manufacturing,automatic drilling and riveting technology is widely used in aircraft component assembly.However,the application of automatic drilling and riveting technology depends on the experience of workshop engineers.The efficiency of automatic drilling and riveting is low,and the riveted parts are easy to deform in the process of batch riveting.Excessive stress and strain may lead to inaccurate assembly.Aiming at solving above problems,the drilling and riveting path planning and a deformation prediction method in the process of riveting are put forwad with the civil aircraft cabin door as the research object in this thesis.The main research contents are as follows:Aiming at the low efficiency of automatic drilling and riveting path of civil aircraft cabin door,it depends on the experience of engineers.An automatic drilling and riveting path planning method integrating ant colony（AC）-genetic algorithm（GA）was proposed.This method divided the cabin door into regions according to the process constraints,introduced the ant colony algorithm into a single region,and improved the heuristic rules and pheromone update strategy combined with the process characteristics.It optimized multiple parameters of the algorithm,and integrated the genetic algorithm（GA）to realize the global path optimization of the cabin door.The effectiveness and superiority of this method were verified by comparison and example verification based on the A320 Civil Aircraft Cabin Door.Aiming at the problem that the cabin door cannot be accurately assembled due to excessive batch riveting stress and strain in the riveting process,a batch riveting deformation prediction method based on "local global" hierarchical mapping was proposed.Firstly,this method took the deformation of single nail riveting as the starting point,then the deformation principle and process flow of single nail riveting of the cabin door were analyzed.The stress and strain of civil aircraft cabin door skin,skeleton and rivet were calculated by explicit dynamic finite element method,and it provided data support for batch riveting deformation prediction.Secondly,based on the local displacement field data of single nail riveting,a "local global" layered mapping deformation prediction model was constructed,and the stress and strain of multi nail riveting under different riveting sequences were calculated based on the model.Finally,the stress-strain results based on the "local global" layered mapping equivalent prediction method and the explicit dynamic finite element method were compared to verify the superiority of the "local global" layered mapping method in solving the prediction problem of batch riveting deformation of cabin door.This thesis provides a research idea for the drilling and riveting path planning and the prediction deformation of batch riveting in the process of automatic drilling and riveting of civil aircraft cabin door,and provides a method support for effectively improving the efficiency of automatic drilling and riveting,predicting riveting deformation and improving assembly quality.